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CVE-2026-82661— Nodemailer CRLF Injection via List-* Header Comments

Quick assessment

Affected
nodemailer nodemailer
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 8.0.9 之前，Nodemailer 未能对列表（list）字段中的换行符（CR）和换行符（LF）字符进行过滤（sanitized），导致攻击者可以注入任意的邮件消息头。能够控制 参数的攻击者可以通过注入 CRLF 序列，在生成的 RFC 822 消息中添加额外的头部字段，从而改变邮件客户端的行为和消息的语义。

CVSS 5.4 · Medium

Possible ATT&CK Techniques 1 AI

T1565.003 · Runtime Data Manipulation
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I. Basic Information for CVE-2026-82661

Vulnerability Information
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Vulnerability Title
Nodemailer CRLF Injection via List-* Header Comments
Source: CVE Program / CVE List V5
Vulnerability Description
Nodemailer before 8.0.9 fails to sanitize carriage return and line feed characters in list comment fields, allowing attackers to inject arbitrary message headers. An attacker with control over list.*.comment parameters can inject CRLF sequences to create additional headers in generated RFC822 messages, altering mail client behavior and message semantics.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
nodemailer nodemailer 0 ~ 8.0.9 -

II. Public POCs for CVE-2026-82661

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III. Intelligence Information for CVE-2026-82661

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Other References for CVE-2026-82661 (2)

Same Patch Batch · nodemailer · 2026-08-31 · 7 CVEs total

CVE-2026-82854 9.8 CRITICAL Nodemailer before 8.0.3 SMTP Command Injection via envelope.size
CVE-2026-82659 7.1 HIGH nodemailer before 9.0.1 File Read and SSRF via raw option
CVE-2026-82662 6.5 MEDIUM Nodemailer before 8.0.8 TLS Certificate Validation Bypass
CVE-2026-82660 5.4 MEDIUM Nodemailer jsonTransport bypasses disableFileAccess and disableUrlAccess
CVE-2024-58379 5.3 MEDIUM nodemailer before 6.9.9 ReDoS via attachDataUrls parameter
CVE-2026-82853 4.9 MEDIUM Nodemailer before 8.0.5 SMTP Command Injection via CRLF

IV. Related Vulnerabilities

Same product: nodemailer
Same vendor: nodemailer
Same weakness: CWE-93

V. Comments for CVE-2026-82661

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